everyone seems to have an opinion on which edition of the 40k rules was / is the best.

so my question is this: do you ever play with old editions of the rules? I've never gotten rid of any of my old 40k books, but I never have gone back to previous editions for a game.

particularly I am thinking of 2nd edition, which seems to have a strong following among gamers who have been playing long enough to have experience with the rule set.